Rats may be everywhere, but NOT in my garden (or house) thank you! My neighbours started keeping chickens a few years ago, and very soon they had a family of rats breeding under their decking, and popping out to feed from the chicken feeders.
Their own measures to catch them failed, so they had to call in the professionals, who soon killed them with poison.
I have seen mice climbing my bird feeders, but if I saw rats then I'm afraid the birds would have to do without until the rats were destroyed.
They are vermin, carry disease, and have no place in my garden.